I'm in the market for some relays to build up circuits to switch track power, signals, and other relays. Unfortunately I'm having trouble understanding the relay spec sheets available. Here are the properties I think I want: 1) Available as plug in modules with a base, so if one goes bad I can pop it out and pop in a new one. 2) Available in multiple forms SPST, DPST, TPST, etc, ideally with the same base to simplify wiring and sparing. 3) For track power, handling up to 18 VDC @ 3 Amps. 4) For signaling and controlling other relays, up to 18 VCD @ 1 Amp. 5) Enclosed to keep dust etc from killing them. Of course, cost effective is a concern. If anyone can provide a recommendation it would be appreciated.
Hi Leo! You probably are looking for KH series "ice cube" relays: http://relays.tycoelectronics.com/datasheets/KHA_DS.pdf A quick check of the usual outlets shows that they can be a bit pricey however, particularly given the current requirements. You might also consider multiple DPST relays with solid state control to implement DPDT, 3PDT, 4PDT configurations.
Humm, those might work, and the price is a bit higher than I might like, but not crazy. Digi-Key - PB455-ND (Tyco Electronics Potter Brumfield - KHAU-11D12-12) So in the $7.50 range, plus a socket if I want them removable. For power routing that's probably ok, price wise. For the control relays that's more than I was hoping for, but perhaps as good as I can do. *sigh*
If you want to buy them new, try http://www.wiringproducts.com/index...dept_40.html&gclid=CNXN9eCxsYsCFQKfYgodfEZy2w Discounts if you buy 25 of something Another alternative would be to go to the nearest pick-n-pull junkyard. Modern cars have relays galore. Oftentimes in a nice Relay Block. How many relays are you planning to stack up at a time? I know the newer Toyotas I work on have several blocks; the ones near the battery are usually good for 6 or 8 relays at least. The mounting panel usually unsnaps from the housing with some plastic ears (If you can remove a locomotive shell, you can do this), so you don't have to have all the fuses and such unless you want to wire them in. Bring a good pair of wire cutters, and maybe some sort of prying tool and start hacking. Better ask the guy what it would cost before you start chopping, though. I'm not familiar with too many automotive applications using doublepole relays. It's usually done with two relays with the control sides wired in parallel.
NAPA For a automotive relay try your local Napa store, or Checker- Auto Zone. Ask for a 12 volt relay- They should have more than one style. You should be able to come up with a SPDT relay that will operate at about 6 volts or less that will operate the contacts. I would think that most electronic supply houses could supply a relay that would be smaller and less $$ than the automotive relays. Try Digi Key- Oh yea! I love DCC.
Leo, Mouser has them. Thie ones on this page may be what you have in mind. Sockets are at the bottom of the page. http://www.mouser.com/catalog/634/1716.pdf Martin Myers
